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Publication numberUS4268741 A
Publication typeGrant
Application numberUS 06/061,310
Publication dateMay 19, 1981
Filing dateJul 27, 1979
Priority dateAug 30, 1978
Also published asCA1124772A1, DE2931623A1
Publication number06061310, 061310, US 4268741 A, US 4268741A, US-A-4268741, US4268741 A, US4268741A
InventorsWilliam J. O'Brien
Original AssigneeBreville Holdings Pty. Limited
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric fry pan
US 4268741 A
Abstract
An electric fry pan in which the pan is formed from cast iron to the underside of which a heat sink of aluminium is secured by mechanical means, the heat sink making close physical contact with a major portion of the underside of the pan. The electric heater element is associated with the heat sink and has connected to it an electrical connector by means of which the heater element may be connected to an electricity supply.
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Claims(6)
I claim:
1. An electric fry pan, comprising an electric heating element connectable with an electric source and having a predetermined configuration; a heat distributing element constituted of aluminum and being in contact with said heating element so as to be heated by the latter; and a pan having an underside with a major portion which is in contact with said heat distributing element so that heat is transmitted from the latter to and distributed over said pan, means for securing said aluminum heat distributing element to said underside of said pan, said electric heating element being secured to said heat distributing element, said electric heating element being electrically insulated from said heat distributing element and said pan, and electric connecting means arranged to connect said electric heating element with the electric source and being electrically insulated from said heat distributing element and said pan, said pan having a bottom wall and side walls constituted of cast iron having high heat capacity and low thermal conductivity, so as to provide for a large heat reservoir ensuring good culinary properties and at the same time to avoid a localization of heat in said pan in the regions corresponding to the configuration of said electric heating element.
2. An electric fry pan as defined in claim 1, wherein said heat distributing element is formed as an aluminum plate having an under face, said electric heating element being secured to said under face of said aluminum plate.
3. An electric fry pan as defined in claim 2, wherein said securing means includes a boss provided on said underside of said pan and having an internally threaded hole, a pressing member arranged to press said heat distributing element against said underside of said pan, and a single threaded member extending through said pressing member and through said threaded hole of said boss of said pan, so as to attach said pressing member and thereby said heat distributing element to said pan.
4. An electric fry pan as defined in claim 3, wherein said threaded member is a screw having a head arranged to abut against said pressing member.
5. An electric fry pan as defined in claim 1; and further comprising a heat shielding element arranged beneath said underside of said pan and secured to the latter, said heat shielding element being provided with a plurality of legs arranged to support said pan when in use.
6. An electric fry pan as defined in claim 1, wherein said bottom wall is of one piece with said side walls so that said pan is a one-piece member of cast iron.
Description
BACKGROUND OF THE INVENTION

The present invention relates to an electric fry pan of the kind in which the fry pan is heated by means of an electric heating element in the base of the pan.

It is well known to make fry pans of aluminium or of aluminium lined with a very thin layer of stainless steel in which the heating element is cast into the underside of the base of the pan, provision being made for the connection of a temperature control device to the heating element. The device is normally connected to the pan by means of a plug and socket connector so as to be removable from the pan when it has to be washed.

Electric fry pans of the kind described above are sold in substantial quantities and generally provide a satisfactory means for cooking a wide variety of foodstuffs. A difficulty does however arise in connection with known fry pans in that the heating element, which is necessarily arranged to form a closed path in the base of the pan, cannot provide heat equally to the whole of the interior surface of the base of the pan; the very good heat conduction properties of aluminium tend to mitigate against this. If for example water is placed in a pan and the heating element energised, the water immediately above the heating element will start to boil first and the outline of the heating element can be readily seen.

It is also well known that fry pans of cast iron have desirable qualities from a culinary point of view, so far as uniformity of heating over the whole area of the base is concerned. It has however not previously been proposed to apply electrical heating to a fry pan of this kind, possibly because of the difficulties of incorporating the heating element in the material of the pan.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a fry pan having in combination the features of the two types of fry pan described above.

The invention consists in an electric fry pan wherein the pan is formed from cast iron to the underside of which a heat sink of aluminium is secured by mechanical means, the heat sink making close physical contact with a major portion of the underside of the fry pan, an electric heater element being associated with the heat sink and having connected to it electrical connector means whereby an electrical connection may be made to the heater element.

In order that the nature of the invention may be better understood a preferred form thereof is hereinafter described by way of example with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view of the underside of a fry pan according to the invention,

FIG. 2 is a median section thereof on line II--II of FIG. 1, and

FIG. 3 is a view of a portion of FIG. 2 to an enlarged scale showing the construction in more detail and illustrating the use of an alternative form of heating element.

DESCRIPTION OF A PREFERRED EMBODIMENT

In the preferred form of the invention a fry pan 10 is made in cast iron by suitable casting techniques. The handle 11 of the pan may itself be cast integrally with it or provision may be made for the attachment of a separate handle.

The underside of the base 12 of the fry pan is flat, apart from the peripheral rim 13 and the central boss 14. The central boss 14 is drilled and the resulting hole internally threaded at 15. The area of the underside of the base 12 between the peripheral rim 13 and the boss 14 is machined to provide a flat surface against which an aluminium heat sink 16 is held in close contact by means of the insulator 17. The whole assembly is held in position by means of a zinc plated brass screw 19 having a moulded plastic head 20. The end of the screw 19 screws into the thread 15 in the boss 14.

Extending over the whole area of the base within the peripheral rim 13 is a metal heat shield 21 which is also held in place by the screw 19 and which has arranged around its periphery three feet 22 on which the fry pan normally stands. These are fixed to the heat shield 21 by screws 23 which also serve to hold the periphery of the heat sink 16 in contact with the underside of the base of the fry pan.

Arranged in contact with the heat sink 16 is the heating element 24 to which is connected an electrical connector 25 by means of which a conventional probe/thermostat 26 can be connected.

The pan may be readily separated from the heat sink, heating element, heat shield and feet by simply unscrewing the head 20 of the screw 19.

FIG. 3, apart from showing the construction in more detail, shows an alternative form of heating element 24a which is of trianglar cross section and which is secured by brazing directly to the underside of the heat sink 16. This form of heating element is preferred as, being applied to the underside of the heat sink, heat is already distributed to some extent before reaching the base 12 of the fry pan 10, the object being to distribute the heat as evenly as possible over the base 12.

Experiment has shown that the construction described above provides very good results which, for certain types of cooking, are superior to those provided by a conventional aluminium fry pan and which in use is more convenient than the conventional cast iron fry pan which requires an external source of heat. It is to be understood that the electric heating elements 24 and 24a and electrical connector 25 are electrically insulated from the pan 10 and the heat sink 16.

The embodiment of the invention described above is given by way of example only as constituting a preferred form of the invention within the scope of the succeeding claims.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3010006 *Oct 2, 1953Nov 21, 1961Webcor IncCooking utensil
US3031735 *Nov 19, 1956May 1, 1962Sunbeam CorpProcess of manufacturing electrically heated cooking vessel
US3064112 *Mar 25, 1958Nov 13, 1962Sunbeam CorpCooking vessel and method of making the same
US3082313 *Aug 25, 1958Mar 19, 1963Sunbeam CorpCooking vessel
US3095498 *Nov 30, 1954Jun 25, 1963S W Farber IncElectric cooking utensil having a detachable thermostatic control means
US3384195 *Apr 15, 1955May 21, 1968Sunbeam CorpElectric frying pan
US3681568 *Dec 15, 1971Aug 1, 1972John Oster MfgElectrically heated cooking appliance
US3798415 *Aug 25, 1972Mar 19, 1974Graham Corp MElectrically heated cooking utensil
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AT115421B * Title not available
DE866220C *Jul 12, 1950Feb 9, 1953Lieselotte BrunnerMit elektrischer Bodenheizung versehener Hochleistungs-Roesttopf
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4458139 *Jul 21, 1982Jul 3, 1984Breville Holdings Pty., LimitedElectrically heated cooking utensil
US4492853 *Jun 8, 1983Jan 8, 1985Meyer Manufacturing Company, LimitedElectrically heated cooking or food heating devices
US4555616 *Aug 28, 1984Nov 26, 1985Breville Holdings Pyt. LimitedElectrically heated wok
US4855572 *Jan 23, 1987Aug 8, 1989Pace IncorporatedHeater for use as either primary or auxiliary heat source and improved circuitry for controlling the heater
US5313928 *Jun 9, 1992May 24, 1994Firelight Leisure Products Ltd.Portable camp stove and barbecue grill
US5477777 *Jul 5, 1994Dec 26, 1995Oppermann; RolfAppliance for heating up and/or keeping warm of food and beverages
US6040562 *Dec 15, 1997Mar 21, 2000Kabushiki Kaisha Kyushu NisshoStructure for uniform heating in a heating device
US6486446 *Oct 15, 2001Nov 26, 2002Yao-Tsung KaoCombination of a bottom of a pan and a heating means
US8931293Apr 12, 2007Jan 13, 2015Duke Manufacturing Co.Food serving bar
US20050045620 *Aug 29, 2003Mar 3, 2005Huang Chen-LungElectric heater
US20050072315 *Oct 29, 2003Apr 7, 2005Emmanuel RomeroCooking assembly
US20090304876 *Jun 6, 2008Dec 10, 2009Weiss Ronald RPopcorn kettle
DE3442291A1 *Nov 20, 1984Jun 13, 1985Breville Holdings Pty LtdVerfahren zur herstellung eines kochgefaesses
EP0072119A2 *Jul 21, 1982Feb 16, 1983Breville Holdings Pty. LimitedElectrically heated cooking utensils
Classifications
U.S. Classification219/439, 219/459.1, 219/530, 219/430, 99/447, 99/422, 219/465.1, 219/438
International ClassificationH05B3/68, A47J37/06, A47J37/10, A47J27/00
Cooperative ClassificationA47J37/105, H05B3/68
European ClassificationA47J37/10B, H05B3/68